A May 2021 study by he University of Glasgow and the University of Newcastle said,

"Our findings underscore the importance of measuring more than just BMI when predicting cancer risk, and suggest that people's body shape may increase their risk of certain cancers", 

"Whatever method you use, being overweight or obese is the single biggest preventable cause of cancer after smoking. More urgent actions are needed to help people maintain a healthy bodyweight and shape throughout their lives, starting at an early age."